http://www.xbitlabs.com/articles/v [...] html#sect0
 
Lows of 9800GX2 accordint to xbit labs:
 
Performs at the level of Nvidia GeForce 8800 GTS 512MB without software SLI support;
Suffers from all the issues typical of contemporary multi-GPU platforms;
Doesn’t support multi-monitor configurations in SLI mode;
High power consumption;
High heat dissipation;
High level of generated noise;
Large size;
Heavy weight;
High price.

Although half of those things arent really a problemm. Same size as other high end cards.

But its this that really sets it apart.
 
Highs:
 
    * Best gaming performance with software optimizations;